Bumping machine



June 22, 1943. 'M. o. ROSE BUMPING MACHINE Fil ed June 27. 1941 EmEEEEmEE ..7//////A Patented June 22, 1943 I UNETED {HATES FATENT FFMIE BUMPING IVIACHINE Millard 0. Rose, Detroit, Mich.

Application June 27, 1941, Serial No. 400,011

1 Claim. (Cl. 153-48) This invention relates to bumping machines the purpose being to provide a new and improved device for removing dents from fenders and other sheet metal surfaces of automobiles and for straightening or re-shaping bent portions thereof.

The invention comprises an anvil adjustable relative to a hammer operable in opposed relathe hammer permitting the anvil and hammer to be properly positioned in opposed relation on the article to be operated on and held in the adjusted position for the bumping operation.

.These and other novel features and objects of the invention are hereinafter more fully described and claimed and the preferred form of a bumping machine embodying my invention is shown in the accompanying drawing in which- Fig. 1 is an elevation showing my improved bumping machine in position for operation upon an automobile fender and showing one typical arrangement of the jointed arm.

Fig. 2 is an elevation showing the apparatus arranged in different position on a fender and with a less number of links or parts in the arm supporting the hammer and anvil.

Fig. 3 is a longitudinal section of the anvil and hammer.

In the form of the invention shown in the drawing, the hammer element is indicated at I and the anvil at 2 positioned on opposed surfaces of a sheet metal element as, for instance, an automobile fender. The hammer is preferably of a vibrating type and by way of illustration but not of limitation I have shown a flexible shaft 3 entering a housing formed of a base 4 and a cap 5 containing a shaft-like portion 6 having an eccentric l thereon bearing on the upper end of a plunger 8 reciprocable in a cylinder 9 and having a shaft-like portion It in threaded engagement with the upper side of a hammer head II, a lock nut I2 being provided to secure the hammer to the shaft ill. The cylinder 9 has a cap I3 secured therein and a spring it serves to maintain the plunger 8 in contact with the eccentric I whereby rotation of the shaft reciprocates the hammer. The cap 5 has an upper extension I5 provided with a toothed face It to engage with a similar toothed face of an end I! of a link I8 of the jonted arm. A cap screw I9 passes through the extension I5 of the cap 5 in threaded relation with the end of the link I1 and, by loosening or tightening the screw, the teeth of the extension I5 and the end of the link ll may-be separated to permit rotative adjustment of the parts I5 and I1 and then locked together by the cap screw iii to maintain the same in adjusted position.

The anvil 2 may be of any approved form and is here shown as being threaded on the end of a threaded rod 25 and secured by the lock nut 2|. The rod 23 inturn is threaded in the end of a holder 22 threaded to receive the same and alock nut 23 secures the rod in adjusted position.

For rotation of the threaded shaft 28, I provide a short bar 23 extending through the rod to opposite sides thereof providing a means for rotating the shaft 23 to thread the same inwardly or outwardly of the holder 22. The holder 22 terminates in a radially toothed end 25 for association with a similar toothed end 23 of an arm 21 and the two radially toothed faces are secured together by a cap screw 28.

B rotation of the screw 20 in one direction, the anvil may be pressed against the sheet metal element 29 while the end of the hammer casing 2 is held in engagement with the opposite surface of the sheet by means of the jointed arm. By rotation of the shaft 6, the hammer may be vibrated while the metal 29 is clamped in place between the hammer casing and anvil.

The jointed arm holds the hammer casing and anvil under pressure and includes the links 38, 3|, 32 connecting the above mentioned links I8 and 29, all of which links are successively united at their ends by radially toothed faces held in contact and locked in position by bolts, such as the bolts 28 heretofore described. The series of links between the hammer casing and anvil are provided to permit the positioning of the hammer and anvil at various points about the surface of a fender, for instance, and then locked in such position and supporting the hammer casing and anvil in opposed relation on opposite faces of the sheet metal element requiring to be straightened.

In Fig. 2 is shown a link consisting of the parts 33 and 34 each having at adjacent ends a serrated face 35 and at the other end an opposed serrated portion to fit a similar serrated end 36 of a link 31. This in turn is connected by a similar joint with a link 38 connected with serrated end of the hammer element. The two portions 33 and 34 of the arm having one end connected to the anvil and the other connected with the link 31 have opposed transversely serrated faces 38 and 39 and one of the members is slotted to receive the bolt 40, the nut 4| therefor being loosened to permit varying the length between the serrated end 35 of the arm 33 and similar end of the arm 34. The adjustment of this arm having the portions 33 and 34 in respect to its length adapts the same to extend inwardly a greater or less distance to support the anvil in the proper position to operate upon a dented portion of a fender, for instance, and to position to permit the hammer and anvil to be properly positioned in opposed relation.

When the parts are in position, the anvil is turned to clamp the metal piece being operated upon between the nose of the hammer casing and the anvil. The bolts 28 are then tightened to secure the arms in the adjusted position. Bearing in mind that the portion of the article being operated upon is securely clamped between the casing or shell for the hammer and the anvil the apparatus is directly upon the element being op- :4

erated upon and the arms are sufiiciently rigidly united to maintain the same in position.

The apparatus, therefore, is inexpensive, comparatively light in weight, may be readily handled and placed in position on a part to be straightened or removed therefrom and provides a device adapted to operate on parts heretofore usually bumped out by hand by the holding of an anvil in one hand and using a hammer having proper form of face to perform the straightening of the dented portion of the fender which is a tedious method.

It is believed evident from the foregoing description that the apparatus is of simple construction, is light in weight adapting the same to be readily moved about and positioned in place for use on sheet metal part or removed therefrom. It is also pointed out that various changes and modifications may be made in the apparatus without departing from the spirit and scope of the invention as set forth in the appended claim and, while I have shown a hammer element operated by a cam or eccentric on a rotating shaft, other means for operating the hammer may be utilized within the defined scope of the invention.

Having thus fully described my invention, its utility and mode of operation, what I claim and desire to secure by Letters Patent of the United States is- A bumping machine comprising a hammer and an anvil, a casing for the hammer, means for reciprocating the hammer in the casing, an anvil, an arm carrying the anvil at, one end, means for adjusting the anvil toward or from the face of the element being bumped opposite that engaged by the casing, a series of arms in a jointed relationship, the arm at one end of the series being rotatably adjustable relative to the hammer casing, and the other end of the series of arms being rotatably adjustable relative to the anvil carrying arm, the series of arms between the two end elements thereof being joined in a rotatably adjustable relationship, and means for rigidly securing the respective arms in adjusted relation one to the other and to the hammer and anvil portions, whereby the said anvil and hammer are held in operative position with the work during the bumping operation.

MILLARD O. ROSE. 

